Hey felow people, i'm relatively new to arduino and i have a problem, i was trying to build a simple car using a H bridge ,a 12v battery and a switch, but, when i turn it on with the switch, the "L" light on the arduino keeps flashing and nothing happens also the project works only via USB. Can someone help me? The car is down below.
Note: i don't have 1,5v batteries if the solution are them
Edit: Also, when i start the program, only one wheel (out 1 and 2) works
Double check your connections. Make sure all the circuits board have a common ground. Meaning all negatives connect together. Signals are connect when they suppose to go. The positive ( power line ) can be separated. You can use the same power ( battery ) but the voltage from the battery have to be 5 V for the Arduino, the 5 V control / sensor board. Only the motors can be connect directly to the battery.
So check your connections. If any connections is wrong, the project will not work properly.
Show a circuit diagram and code
@mathius7076, welcome.
Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project 
See About the Installation & Troubleshooting category.
What sketch did you upload to the Arduino?
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